Composite color separation system

ABSTRACT

A composite color separation system, comprises: a light control module, a light guide module and a light splitting module. The light control module has a lighting unit and a lens unit, in which the lighting unit includes an array of lighting elements whereas there are at least two types of lighting elements in the array for emitting at least two beams of different wavelengths. The light from the lighting unit is directed to enter the lens unit before being discharged out of the light control module. The light guide module comprises: a first light incident surface, for receiving the beams from the light control module; a first light emergence surface; and a light guide structure, for guiding the beams to the first light emergence surface where they are discharged out of the light guide module to the light splitting module. The light splitting module is used for splitting the beams.

CROSS-REFERENCE TO RELATED APPLICATIONS

This non-provisional application claims priority under 35 U.S.C. §119(a)on Patent Application No(s). 099110073 filed in Taiwan, R.O.C. on Apr.1, 2010, the entire contents of which are hereby incorporated byreference.

TECHNICAL FIELD

The present disclosure relates to a composite color separation system,and more particularly, to a color separation system capable of acting inreplacement of the conventional color filters (CF) used in opticaldevices, such as display panels, image sensors and color camcorders, forits simplicity and high optical efficiency.

TECHNICAL BACKGROUND

In a flat display, a backlight source is often used in combination witha spatial light modulator and a color filter to present full-colorimages. In an image sensor of a digital camera, a color filter is alsoused in combination with color difference calculation to reproduce thecolor of an original object. In larger systems such as a color videocamera or a back projection TV, a three-plate or two-plate prism set ora color filter is used in combination with a collimated light source topresent full-color images. When the color filter is used in suchsystems, because each shading pixel can only present a single primarycolor of the RGB three primary colors, about two-thirds of energy of theincident white light is absorbed, thus decreasing the efficiency ofusing the light and shortening the lifespan of the battery. In addition,fabrication of the color filter can be rather complex and more than onesemiconductor photolithography processes are needed for each primarycolor, which results in a high cost.

Please refer to FIG. 1 to FIG. 3, which show a common light separationarchitecture used in conventional color camcorders. There are threetypes of light separation architectures, which are a three-plateprism-type optical system composed of a zoom lens 1, an infrared filter2, a three-plate prism 3, a red light charge-coupled device (CCD) 4, agreen light CCD 5, and a blue light CCD 6, as shown in FIG. 1; atwo-plate dichroic prism-type optical system composed of a zoom lens 1,an infrared filter 2, a two-plate prism 7, a red-blue filter 8, ared-blue light CCD 9, a green light CCD 5, as shown in FIG. 2; and anoptical system with single-plate color filter composed of a zoom lens 1,an infrared filter 2, a red-green-blue filter 10 and a red-green-bluelight CCD 11, as shown in FIG. 3 Among which, both the optical systemsshown in FIG. 1 and FIG. 2, that are designed to achieve lightseparation by the use of their prisms and optical interference films,are disadvantageous in their bulky sizes and complex structures withplenty of optical elements required. However, the optical structureshown in FIG. 3, which directly uses a color filter for lightseparation, can be suffered by its low optical efficiency.

Therefore, researchers all over the world are working tirelessly to comeup with all kinds of new techniques for overcoming the aforesaidshortages. One such study is disclosed in a paper published in Journalof SID 16/8, 2008, by Philips Co., and also in a paper published inEURODISPLAY 2002, pages 339˜342, by IBM, both of which use asub-wavelength structure for splitting an incident beam into multiplebeams of various colors and then enable the resulting beams to befocused on their corresponding sub-pixels by the use of a micro-lensarray, so that cooperatively are capable of working as a substitute forthe conventional dye photoresist. However, they both suffer thefollowing shortcomings:

(1) it is not a easy task for producing a large-area sub-wavelengthstructure whose pitch is about 320 nm;

(2) the resulting light emitting thereby has poor uniformity; and

(3) high production cost.

Moreover, in U.S. Pat. No. 5,615,024A, entitled “Color Display Devicewith Chirped Diffraction Gratings”, a blazed diffraction grating capableof acting in replacement of color filters for separating an incidentbeam into beams of primary colors is disclosed, in which the resultingbeams are primarily first order diffraction beams. Accordingly, when theaforesaid structure is applied in display panels, the beam of oneprimary color should be directed to correspond to one pixel. However, bythe usage of the first order diffraction beams, a large included anglewill be formed between its incident beam and emitting beam so that theincident beam must be directed to enter the blazed grating by a largerangle so as to enable the resulting emitting beam to enter its liquidcrystal layer following the normal of the same. On the other hand, ifthe incident beam enter the blazed grating perpendicularly, it willresult the emitting beam to enter the liquid crystal layer in a largeangle which will require to have additional refraction elements forcorrecting the deviation, otherwise, it can not be applied in thindisplay panels.

In U.S. Pat. No. 4,807,978, entitled “Color Display Device and MethodUsing Holographic Lenses”, a holographic lens set capable of acting inreplacement of color filters for separating an incident beam into beamsof primary colors is disclosed, in which the resulting beams areprimarily first order diffraction beams. Accordingly, when the aforesaidstructure is applied in display panels, the beam of one primary colorshould be designed to correspond to one pixel. As the color separationin the aforesaid U.S. patent requires the holographic lens set to becomposed of three layers of holographic lenses, not only it is extremelydifficult to fabricate, but also it is difficult to align the lensarrays precisely with respect to each other. In addition, as there issevere cross talk between the resulting beams of three primary colors,the use of such holographic lenses in color display device will sufferhigh noise.

In U.S. Pat. No. 5,764,389, entitled “Holographic Color Filters forDisplay Applications, and Operating Method”, a holographic set capableof acting in replacement of color filters for separating an incidentbeam into beams of primary colors is disclosed, in which first anincident beam is separated into beams of different spectral regionscorresponding to the three primary colors by the use of a holographiccolor filter, and then another holographic color filter is used fordeflecting the optical paths of the resulting beams in a manner that thebeam of one primary color is directed to correspond to one pixel.Similarly, since there are multiple layers of holographic color filtersused for achieving the color separation, not only the optical efficiencyis poor, but also it is difficult to align the holographic color filtersprecisely with respect to each other.

In the image sensor disclosed in TW Pat. No. M249217, a set of lenses isused in cooperation with a prism set, as a substitute to color filters,for separating an incident beam into beams of primary colors whiledeflecting the optical paths of the resulting beams in a manner that thebeam of one primary color is directed to correspond to one pixel. As thelens set is disposed on the prism set and the shape of the prism iscomparatively unsymmetrical with respect to the optical field of theimage sensor, it is practically infeasible despite of its good opticalefficiency.

Therefore, it is in need of a color separation system capable of actingin replacement of the conventional color filters for its simplicity andhigh optical efficiency. In addition, the color separation system shouldbe able to separating an incident beam into a red, a green and a bluelight beam that are directed to enter a liquid crystal layer of adisplay panel in a vertical manner with satisfactory optical efficiency.

TECHNICAL SUMMARY

Accordingly, the present disclosure is directed to a color separationsystem capable of acting in replacement of the conventional colorfilters used in optical devices, such as display panels, image sensorsand color camcorders, for its simplicity and high optical efficiency.

The present disclosure provides a composite color separation system,which comprises:

a light control module, configured with at least one lighting unit andat least one lens unit, while enabling each lighting unit to be formedas an array of symmetrically disposed lighting elements and each arrayto be composed of at least two types of lighting elements so as toenable each lighting unit to emit correspondingly at least two types ofincident beams of different wavelengths to its corresponding lens unitand then out of the light control module;

a light guide module, configured with a first light incident surface, alight guide structure and a first light emergence surface in a mannerthat the first light incident surface is provided for receiving theplural incident beams from the light control module; and the light guidestructure is used for guiding the plural incident beams to the firstlight emergence surface where they are discharged out of the light guidemodule; and

a light splitting module, for receiving and splitting the pluralincident beams from the light guide module and then projecting the splitbeams out of the light splitting module.

Further scope of applicability of the present application will becomemore apparent from the detailed description given hereinafter. However,it should be understood that the detailed description and specificexamples, while indicating exemplary embodiments of the disclosure, aregiven by way of illustration only, since various changes andmodifications within the spirit and scope of the disclosure will becomeapparent to those skilled in the art from this detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure will become more fully understood from thedetailed description given herein below and the accompanying drawingswhich are given by way of illustration only, and thus are not limitativeof the present disclosure and wherein:

FIG. 1 is a schematic diagram showing a conventional three-plateprism-type optical system.

FIG. 2 is a schematic diagram showing a conventional two-plate dichroicprism-type optical system.

FIG. 3 is a schematic diagram showing a conventional optical system withsingle-plate color filter.

FIG. 4 is a three-dimensional view of a composite color separationsystem according to an embodiment of the present disclosure.

FIG. 5 is a top view of a light control module with biconvex lens unitsaccording to a first embodiment of the disclosure that illustrates theoptical paths of the incident beams traveling from the light controlmodule to the light guide module.

FIG. 6 is a side of the light control module with biconvex lens units ofFIG. 5 that illustrates the optical paths of the incident beamstraveling from the light control module to the light guide module.

FIG. 7 is a top view of a light control module with biconcave lens unitsaccording to a second embodiment of the disclosure.

FIG. 8 is a side view of an assembly of a light control module and alight guide module that is attached with a reflective structureaccording to the present disclosure.

FIG. 9 is a side view of a light splitting module according to a firstembodiment of the invention.

FIG. 10 is a side view of a light splitting module according to a secondembodiment of the invention.

FIG. 11 is a side view of a light splitting module according to a thirdembodiment of the invention.

FIG. 12 is a side view of a light splitting module according to a fourthembodiment of the invention.

FIG. 13 is a side view of a light splitting module according to a fifthembodiment of the invention.

FIG. 14 is a side view of a light splitting module according to a sixthembodiment of the invention.

FIG. 15 is a side view of a light splitting module according to aseventh embodiment of the invention.

FIG. 16 is a side view of a light splitting module according to aneighth embodiment of the invention.

DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

For your esteemed members of reviewing committee to further understandand recognize the fulfilled functions and structural characteristics ofthe disclosure, several exemplary embodiments cooperating with detaileddescription are presented as the follows.

Please refer to FIG. 4, which is a three-dimensional view of a compositecolor separation system according to an embodiment of the presentdisclosure. In FIG. 4, the composite color separation system iscomprised of: a light control module 20, a light guide module 30 and alight splitting module 40, in which the light control module 20 is usedfor collimating or converging a plurality of incident beams of variouswavelengths to the light guide module 30 by different incident angles;the light guide module 30, being configured with a first light incidentsurface 31 and a first light emergence surface 32, is used for guidingthe plural incident beams entering therein from the light control module20 to the first light emergence surface 2 where they are discharged outof the light guide module 30 and then enter the light splitting module40; and the light splitting module 40 is used for enabling the receivedbeams to travel in a specified direction or respectively toward aspecified location.

As the embodiment shown in FIG. 4 to FIG. 6, the light control module 20is configured with four lighting units 21 and four lens units 22 in aone-on-one manner, wherein each lighting unit is an array of fivelighting elements. Moreover, In the exemplary embodiment, the periods ofthe lighting units 21 and the lens units 22 are ranged between 100 μmand 1500 μm, but they can be determined according to actual requirementand thus are not limited thereby.

In addition, each of the lighting units 21 is composed of a plurality ofsymmetrically disposed lighting elements that the lighting unit can beany type of light source, only if it is a collimated light sourcecapable of emitting a visible beams whose wavelength is ranged between400 nm and 650 nm, such as a laser source. In this embodiment, each ofthe lighting unit 21 is composed of two red-light LEDs, two green-lightLEDs and one blue-light LED, representing as R, G, and B in FIG. 5. Inthis embodiment, the blue-light LED is used for emitting a firstincident beam Lb of a first wavelength, each of the green LEDs is usedfor emitting a second incident beam Lg of a second wavelength, and eachof the red-light LEDs is used for emitting a third incident beam Lr of athird wavelength. In addition, in each lighting unit 21 shown in FIG. 5,the blue-light LED is being arranged at the center while enabling thetwo red-light LEDs and the two green-light LEDs to be arrangedsymmetrically at the two opposite sides of the blue-light LED. Indetail, the two green-light LEDs are respectively and symmetricallyarranged at the two opposite sides of the blue-light LED, whereas thetwo red-light LEDs are being respectively and symmetrically arranged atthe outer sides of their corresponding green-light LEDs that are awayfrom the blue-light LED. Accordingly, the blue-light LED, the twogreen-light LEDs and the two red-light LEDs are symmetrically arrangedin the lighting unit 21 while allowing the two red-light LEDs to bearranged at the outermost locations, and thereby, the first incidentbeam Lb from the blue-light LED, the second incident beams Lg from thegreen-light LEDs and the third incident beams Lr from the red-light LEDsare projected toward their corresponding lens unit 22 while allowing theincident angle of each of the incident beams with respect to the opticalaxis of its corresponding lens unit 22 to be ranged between −45 degreesand +45 degrees. It is noted that the range of the incident angle can bevaried according to actual requirement, and thus is not limited thereby.

In this embodiment, each of the lens units 22 can be made of atransparent lens having a refraction microstructures or diffractionmicrostructures formed thereon, and the refractive indexes of the lensunit 22 should be ranged between 1.35 and 1.65. As the embodiment shownin FIG. 5, each of the lens units 22 is a biconvex lens configured witha second light incident surface 221 and a second light emergence surface222. Accordingly, the first incident beam Lb, the second incident beamsLg and the third incident beams Lr that are projected to the lens unit22 will enter the lens unit 22 through the second light incident surface221 and then out of the same through the second light emergence surface222. It is noted that there is a gap D formed between the second lightemergence surface 222 and the first light incident surface 31 of thelight guide module 30, whereas the gap is filled with air whoserefractive index is about 1.0. Thereby, the first incident beam Lb, thesecond incident beams Lg and the third incident beams Lr can becollimated and converged by the lens units 22 in a manner that they arerespectively projected to enter the light guide module 30 by differentincident angles.

In addition, the light control module 20 further comprises a firstreflective structure, which includes a first reflection panel 23 and asecond reflection panel 24 that are disposed respectively covering a topsurface and a bottom surface of the light control module 20, as shown inFIG. 4 and FIG. 6. By the reflection of the first reflection panel 23and the second reflection panel 24, the amount of the plural incidentbeams including the first incident beam Lb, the second incident beams Lgand the third incident beams Lr, that are reflected and thus projectedtoward and passing the lens units 22 is increased so that the lightharvesting efficiency is increased. Nevertheless, the arrangement of thefirst reflective structure is dependent upon actual requirement, that itcan be arranged at a side of the light control module 20 and is notbeing limited to be configured with the aforesaid first reflection panel23 and the second reflection panel 24 that are disposed respectivelycovering the top and bottom of the light control module 20.

As shown in FIG. 4 to FIG. 6, in addition to the first light incidentsurface 31 and the first light emergence surface 32, the light guidemodule 30 is further configured with a light guide structure 33. Thelight guide structure can be a structure of reflection/refractionmicrostructures or a structure of V-shaped grooves that are capable ofguiding the first incident beam Lb, the second incident beams Lg and thethird incident beams Lr to the first light emergence surface 32 enablingthose to be discharged thereout in a direction parallel with the normaldirection of the first light emergence surface 32 of the light guidemodule, i.e. in a direction perpendicular to the first light emergencesurface 32 as shown in FIG. 6.

There is no restriction relating to where the light guide structure 33should be located and also there is no restriction relating to its lightguiding direction. In this embodiment the first light incident surface31 is position to the right of the light guide module 30 and the firstlight emergence surface 32 is arranged at the top of the light guidemodule 30 while enabling the first light incident surface 31 and thefirst light emergence surface 32 to be positioned perpendicular to eachother, and consequently, the light guide structure 33 is disposed on asurface corresponding to the first light emergence surface 32, that is,it is disposed on the bottom of the light guide module 30. Accordingly,as soon as first incident beam Lb, the second incident beams Lg and thethird incident beams Lr are projected entering the light guide module 30through the first light incident surface 31 that is substantially theright side of the light guide module 31, they will be reflected by thelight guide structure toward the first light emergence surface 32 wherethey are discharged out of the light guide module 30 and then enteringthe light splitting module 40, as shown in FIG. 4. Thereafter, by thelight splitting module 40, the first incident beam Lb, the secondincident beams Lg and the third incident beams Lr are enabled to travelin a specified direction or respectively toward a specified location.

From the above description, it is noted that the first light incidentsurface 31, the first light emergence surface 2 and the light guidestructure 33 can be disposed at positions corresponding to each otherthat are determined according to actual requirement and thus are notrestricted by any specification, which is also true for the lightguiding direction of the light guide structure. Moreover, the lightguide module 30 can be further configured with a second reflectivestructure, which is substantially a third reflection panel 34 arrangedat the bottom of the light guide module 30, i.e. it is disposed at asurface of the light guide module 30 opposite to the first lightemergence surface 32. In this embodiment, the first light emergencesurface 32 is arranged at the top of the light guide module 30 and thusthe third reflection panel 34 is arranged at the bottom of the lightguide module 30. Consequently, by the reflection of the third reflectionpanel 34, the amount of the plural incident beams including the firstincident beam Lb, the second incident beams Lg and the third incidentbeams Lr, that are reflected and thus projected toward the first lightemergence surface 32 is increased so that the light harvestingefficiency is increased. Similarly, the arrangement of the secondreflective structure is dependent upon actual requirement, that it canbe arranged at a side of the light guide module 30 and is not beinglimited to be arranged at the bottom of the light guide module 30.Moreover, the third reflection panel 34 can be integrally formed withthe second reflection panel 24.

Please refer to FIG. 7, which is a top view of a light control modulewith biconcave lens units according to a second embodiment of thedisclosure. In this embodiment, each of the lens units 22A in the lightcontrol module 20A is a biconcave lens, and similarly the biconcave lensis configured with a second light incident surface 221A and a secondlight emergence surface 222A. Thereby, the first incident beam Lb, thesecond incident beams Lg and the third incident beams Lr are projectedentering the lens unit 22A through the second light incident surface221A and then are discharged out of the same through the second lightemergence surface 222A. It is noted that that there is a gap DA formedbetween the second light emergence surface 222A and the first lightincident surface 31 of the light guide module 30, whereas the gap isfilled with air whose refractive index is about 1.0. In addition, eachof the lens units 22A can be made of a transparent lens having arefraction microstructures or diffraction microstructures formedthereon, and the refractive indexes of the lens unit 22A should beranged between 1.35 and 1.65. The lens units in the abovementioned twoembodiments are used for converging the incident beams while controllingthe incident angles of those incident beams entering the light guidemodule, and therefore, the types of the lens units can be varied thatare not limited by the aforesaid embodiments.

Please refer to FIG. 8, which is a side view of an assembly of a lightcontrol module and a light guide module that is attached with areflective structure according to the present disclosure. In theembodiment shown in FIG. 8, the light guide module 30A is stacked on topof the light control module 20B. As shown in FIG. 8, the light controlmodule 20B is configured with a lighting unit 21 and a lens unit 22B, inwhich the lens unit 22B is formed with a second light incident surface221B and a second light emergence surface 222B, and the lighting unit21B is comprised of a plurality of collimated lighting elements that aresymmetrically disposed in a manner similar to the lighting unit 21 ofFIG. 5. Moreover, the lighting unit 21 is capable of emitting aplurality of incident beams of different wavelengths, including thefirst incident beam Lb, the second incident beams Lg and the thirdincident beams Lr, while enabling those beams to enter the lens unit 22Bthrough the second light incident surface 221B, and then project out ofthe lens unit 22B through the second light emergence surface 222B.Moreover, there is a reflective structure 50 disposed at a positionbetween the light control module 20B and the light guide module 30A tobe used for directing the first incident beam Lb, the second incidentbeams Lg and the third incident beams Lr to the light guide module 30Adisposed on top of the light control module 20B. As shown in FIG. 8, thereflective structure 50 is configured with an optical entrance 51 and anoptical exit 52, in that the optical entrance 51 is used for receivingthe first incident beam Lb, the second incident beams Lg and the thirdincident beams Lr from the light control module 20B; and the opticalexit 52 is used for projecting and guiding the first incident beam Lb,the second incident beams Lg and the third incident beams Lr that arereflected by the reflective structure 50 out of the reflective structure50 and then onto the first light incident surface 31A of the light guidemodule 30A. It is noted that the arrangement of the light control moduleas well as the light guide module can be designed according to actualrequirement, and thus are not limited by the aforesaid embodiment.

As shown in FIG. 4 and FIG. 9, the light splitting module 40 is furthercomprised of: a first beam splitting plate 41 and a liquid crystal layer42, in which the first beam splitting plate 41 is adhered to the liquidcrystal layer 42 by the use of an adhesive 43. In this embodiment, therefractive index of the first beam splitting plate 41 is ranged between1.35 and 1.65, while the refractive index of the adhesive 43 is rangedbetween 1.3 and 1.58. Moreover, the first beam splitting plate 41 isformed with a third light incident surface 411 and a third lightemergence surface 412, in that the third light incident surface 411 isformed with periodic spherical refraction microstructures while thethird light emergence surface 412 is formed with periodic refractionmicrostructures. Thereby, the first incident beam Lb, the secondincident beams Lg and the third incident beams Lr from the first lightemergence surface 32 of the light guide module 30 are projected onto thethird light incident surface 411 where they are converged and then beingdirected to the third light emergence surface 412, at which the opticalpaths of the first incident beam Lb, the second incident beams Lg andthe third incident beams Lr are deflected toward the liquid crystallayer 42 in positions respectively corresponding with multiplesub-pixels thereof, as the positions R, G, and B indicated in the FIG.9, while being enabled to be discharged thereout in a direction parallelwith the normal direction of the first light emergence surface 32 of thelight guide module 30 and then entering sequentially into the adhesive43, the liquid crystal layer 42, and thereafter out of the liquidcrystal layer 42.

Please refer to FIG. 10, which is a side view of a light splittingmodule according to a second embodiment of the invention. The lightsplitting module 40A shown in FIG. 10 also includes a first beamsplitting plate 41A and a liquid crystal layer 42A, whereas the firstbeam splitting plate 41A is similarly adhered to the liquid crystallayer 42A by the use of an adhesive 43A. The difference between theembodiment shown in FIG. 10 and that shown in FIG. 9 is that: theadhesive 43A used in the embodiment of FIG. 10 is a flake-like dry gel,by that there can be gaps 44A formed between the adhesive 43A and thefirst beam splitting plate 41A whereas each gap 44A is formed in amanner selected from the group consisting of: the gap is vacuumed, thegap is filled with air, and the combination thereof.

Please refer to FIG. 11, which is a side view of a light splittingmodule according to a third embodiment of the invention. The lightsplitting module 40B shown in FIG. also includes a first beam splittingplate and a liquid crystal layer 42B, whereas the first beam splittingplate 41B is similarly adhered to the liquid crystal layer 42B by theuse of an adhesive 43B; and also the first beam splitting plate 41B isformed with a third light incident surface 411B and a third lightemergence surface 412B. The difference between the embodiment shown inFIG. 11 and that shown in FIG. 9 is that: the third light emergencesurface 412B has a portion of its surface area being formed withrefractive microstructures 413B at positions corresponding to theoptical path of the third incident beams Lr that they are functioned fordeflecting the optical path of the incident beams Lr.

Please refer to FIG. 12, which is a side view of a light splittingmodule according to a fourth embodiment of the invention. The lightsplitting module 40C shown in FIG. also includes a first beam splittingplate 41C and a liquid crystal layer 42C, whereas the first beamsplitting plate 41C is similarly adhered to the liquid crystal layer 42Cby the use of an adhesive 43C; the first beam splitting plate 41C isformed with a third light incident surface 411C and a third lightemergence surface 412C; and also the third light emergence surface 412Chas a portion of its surface area being formed with refractivemicrostructures 413C. The difference between the embodiment shown inFIG. 12 and that shown in FIG. 11 is that: the adhesive 43C used in theembodiment of FIG. is a flake-like adhesive, by that there can be gaps44C formed between the adhesive 43C and the first beam splitting plate41C whereas each gap 44C is formed in a manner selected from the groupconsisting of: the gap is vacuumed, the gap is filled with air, and thecombination thereof.

Please refer to FIG. 13, which is a side view of a light splittingmodule according to a fifth embodiment of the invention. The lightsplitting module 40D shown in FIG. 13 is configured with a first beamsplitting plate 41D, a liquid crystal layer 42D and a second beamsplitting plate 43D, whereas the liquid crystal layer 42D are sandwichedbetween the first and the second beam splitting plates 41D, while beingadhered thereto by the use of adhesives 44D and 45D. In this embodiment,the refractive indexes of the first beam splitting plate 41D and thesecond beam splitting plate 43D are ranged between 1.35 and 1.65.Moreover, the first beam splitting plate 41D is formed with a thirdlight incident surface 411D and a third light emergence surface 412D,and the second beam splitting plate 43D is formed with a fourth lightincident surface 431D and a fourth light emergence surface 432D, in thatthe third light incident surface 411D is formed with periodic sphericalrefraction microstructures while the fourth light emergence surface 432Dis formed with periodic refraction microstructures. Thereby, the firstincident beam Lb, the second incident beams Lg and the third incidentbeams Lr from the first light emergence surface 32 of the light guidemodule 30 are projected onto the third light incident surface 411D wherethey are converged and then being directed to enter the liquid crystallayer 42 in respective, and then projected toward the fourth lightemergence surface 432D, at which the optical paths of the first incidentbeam Lb, the second incident beams Lg and the third incident beams Lrare deflected for enabling the same to be discharged thereout in adirection parallel with the normal direction of the first lightemergence surface 32 of the light guide module 30. In addition, there isan adhesive 46D disposed on the fourth light emergence surface 432D. Itis noted that any of the aforesaid adhesives 44D, 45D and 46D can be adry gel or wet gel. In this embodiment, the adhesive 46D is a type ofwet gel. As the first incident beam Lb, the second incident beams Lg andthe third incident beams Lr are projected passing through the first beamsplitting plate 41D, the liquid crystal layer 42D and the second beamsplitting plate 43D in sequence, the light splitting effect achieved inthe present embodiment is similar to those being achieved by thosedisclosed in FIG. 9 to FIG. 12.

Please refer to FIG. 14, which is a side view of a light splittingmodule according to a sixth embodiment of the invention. The lightsplitting module 40E shown in FIG. 14 is configured with a first beamsplitting plate 41E, a liquid crystal layer 42E and a second beamsplitting plate 43E, whereas the liquid crystal layer 42E are sandwichedbetween the first and the second beam splitting plates 41E, 43E whilebeing adhered thereto by the use of adhesives 44E and 45E; and the firstbeam splitting plate 41E is formed with a third light incident surface411E and a third light emergence surface 412E, while the second beamsplitting plate 43E is formed with a fourth light incident surface 431Eand a fourth light emergence surface 432E. The difference between theembodiment shown in FIG. 14 and that shown in FIG. 13 is that: there isno adhesive formed on the fourth light emergence surface of the secondbeam splitting plate 43E.

Please refer to FIG. 15, which is a side view of a light splittingmodule according to a seventh embodiment of the invention. The lightsplitting module 40F shown in FIG. 15 is configured with a first beamsplitting plate 41F, a liquid crystal layer 42F and a second beamsplitting plate 43F, whereas the liquid crystal layer 42F are sandwichedbetween the first and the second beam splitting plates 41F, 43F whilebeing adhered thereto by the use of adhesives 44F and 45F; and the firstbeam splitting plate 41F is formed with a third light incident surface411F and a third light emergence surface 412F, while the second beamsplitting plate 43F is formed with a fourth light incident surface 431Fand a fourth light emergence surface 432F; and there is an adhesive 46Fformed on the fourth light emergence surface 42F. The difference betweenthe embodiment shown in FIG. 15 and that shown in FIG. 13 is that: thefourth emergence surface 432F has a portion of its surface area beingformed with refractive microstructures 433F at positions correspondingto the optical path of the third incident beams Lr that they arefunctioned for deflecting the optical path of the incident beams Lr asthose disclosed in FIG. 14. In addition, by waiving the adhesive 46F inthe seventh embodiment, another light splitting module is formed as theeighth embodiment shown in FIG. 16. In FIG. 16, a light splitting module40G is configured with a first beam splitting plate 41G, a liquidcrystal layer 42G and a second beam splitting plate 43G, whereas theliquid crystal layer 42G are sandwiched between the first and the secondbeam splitting plates 41G, 43G while being adhered thereto by the use ofadhesives 44G and 45G; and the first beam splitting plate 41G is formedwith a third light incident surface 411G and a third light emergencesurface 412G, while the second beam splitting plate 43G is formed with afourth light incident surface 431G and a fourth light emergence surface432G; but there is no adhesive formed on the fourth light emergencesurface 432G of the second beam splitting plate 43G.

To sum up, the preset disclosure provides a composite color separationsystem, which is an assembly of three optical modules of specificallydesigned structures. The three optical modules are a light controlmodule, a light guide module and a light splitting module, wherein thelight control module, being configured with light sources capable ofemitting beams of different wavelengths, is able to control the beams ofdifferent wavelengths to enter the light guide module by differentincident angles; the light guide module is functioned to guide thoseincident beams toward its light emergence surface for discharging andentering the light splitting module; and the light splitting module isprovided for enabling the received beams to travel in a specifieddirection or respectively toward a specified location. Therefore, thecolor separation system of the present disclosure is capable of actingin replacement of the conventional color filters (CF) used in opticaldevices, such as display panels, image sensors and color camcorders, forits simplicity and high optical efficiency.

With respect to the above description then, it is to be realized thatthe optimum dimensional relationships for the parts of the disclosure,to include variations in size, materials, shape, form, function andmanner of operation, assembly and use, are deemed readily apparent andobvious to one skilled in the art, and all equivalent relationships tothose illustrated in the drawings and described in the specification areintended to be encompassed by the present disclosure.

1. A composite color separation system, comprising: a light controlmodule, configured with at least one lighting unit and at least one lensunit, while enabling each lighting unit to be formed as an array of aplurality of symmetrically disposed lighting elements and each array tobe composed of at least two types of lighting elements so as to enableeach lighting unit to emit correspondingly at least two types ofincident beams of different wavelengths to its corresponding lens unitand then out of the light control module; a light guide module,configured with a first light incident surface, a light guide structureand a first light emergence surface in a manner that the first lightincident surface is provided for receiving the plural incident beamsfrom the light control module; and the light guide structure is used forguiding the plural incident beams to the first light emergence surfacewhere they are discharged out of the light guide module; and a lightsplitting module, for receiving and splitting the plural incident beamsfrom the light guide module and then projecting the split beams out ofthe light splitting module.
 2. The composite color separation system ofclaim 1, wherein each of the arrays comprise: at least one firstlighting element, each capable of emitting a first incident beamfeaturing by a first wavelength; and at least two second lightingelements, each capable of emitting a second incident beam featuring by asecond wavelength while enabling the at least two second lightingelements to be disposed symmetrically at two opposite sides of the atleast one first lighting element.
 3. The composite color separationsystem of claim 2, wherein each of the arrays further comprise: at leasttwo third lighting elements, each capable of emitting a third incidentbeam featuring by a third wavelength while enabling the at least twothird lighting elements to be disposed symmetrically at two oppositesides of the at least one first lighting element and at two oppositepositions outside the at least two second lighting elements.
 4. Thecomposite color separation system of claim 1, wherein each of the plurallighting elements is a light emitting diode (LED); and there are atleast two types of LED in each array that are selected from the groupconsisting of: red-light LED, blue-light LED and green-light LED.
 5. Thecomposite color separation system of claim 1, wherein the incident angleof each of the plural incident beams with respect to the optical axis ofits corresponding lens unit is ranged between −45 degrees and +45degrees.
 6. The composite color separation system of claim 1, whereineach lens unit configured with a second light incident surface and asecond light emergence surface in a manner that the second lightincident surface is provided for receiving the plural incident beams;and the second light emergence surface is provided for the pluralincident beam to be projected out of the lens unit therefrom.
 7. Thecomposite color separation system of claim 6, wherein there is a gapformed between the second light emergence surface and the first lightincident surface while enabling the gap to be filled with air.
 8. Thecomposite color separation system of claim 1, wherein the light controlmodule further comprises: a first reflective structure, disposedcovering a top surface and a bottom surface of the light control modulefor reflecting the plural incident beams.
 9. The composite colorseparation system of claim 1, wherein the light guide module furthercomprises: a second reflective structure, for reflecting the pluralincident beams that enter the light guide module from the first lightemergence surface back to the first light emergence surface.
 10. Thecomposite color separation system of claim 9, wherein the secondreflective structure is disposed on a surface of the light guide modulethat is opposite to and the first light emergence surface.
 11. Thecomposite color separation system of claim 1, wherein the lightsplitting module is further configured with a first beam splitting platehaving periodic microstructures formed thereon and a liquid crystallayer while enabling the plural incident beams from the light guidemodule to be converged by the first beam splitting plate whiledeflecting the optical paths thereof toward the liquid crystal layer inpositions respectively corresponding with multiple sub-pixels thereof,and thereafter, enabling those to be discharged thereout in a directionparallel with the normal direction of the first light emergence surfaceof the light guide module.
 12. The composite color separation system ofclaim 11, wherein the first beam splitting plate further comprise: athird light incident surface, formed with periodic spherical refractionmicrostructures, for converging the plural incident beams from the lightguide module; and a third light emergence surface, formed with periodicrefraction microstructures, for deflecting the plural incident beamstoward the liquid crystal layer in positions respectively correspondingwith multiple sub-pixels thereof.
 13. The composite color separationsystem of claim 1, wherein the light splitting module further comprise:a first beam splitting plate, further comprises: a third light incidentsurface, formed with periodic spherical refraction microstructures, forconverging the plural incident beams from the light guide module; and athird light emergence surface; a second beam splitting plate, furthercomprises: a fourth light incident surface; and a fourth light emergencesurface, formed with periodic refraction microstructures, for deflectingthe optical paths of the plural incident beams and thus enabling thoseto be discharged thereout in a direction parallel with the normaldirection of the first light emergence surface of the light guidemodule; and a liquid crystal layer, sandwiched between the first beamsplitting plate and the second beam splitting plate.
 14. The compositecolor separation system of claim 1, further comprising: a reflectivestructure, disposed at a position between the light control module andthe light guide module, for receiving and reflecting the plural incidentbeams from the light control module to the first light incident surfaceof the light guide module.